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Securities (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale securities, Amortized Cost    
Total $ 1,441,724 $ 1,389,255
Available-for-sale securities, Fair value    
Total 1,428,617 1,384,750
Total debt securities    
Available-for-sale securities, Amortized Cost    
Due in one year or less 17,878 53,936
Due after one year through five years 376,777 351,462
Due after five years through ten years 210,985 219,161
Due after ten years 13,827 13,098
Total 619,467 637,657
Available-for-sale securities, Fair value    
Due in one year or less 18,034 54,735
Due after one year through five years 378,631 353,736
Due after five years through ten years 208,999 218,561
Due after ten years 13,181 12,749
Total 618,845 639,781
Mortgage-backed securities    
Available-for-sale securities, Amortized Cost    
Total 822,257 751,598
Available-for-sale securities, Fair value    
Total $ 809,772 $ 744,969